linux-kernel - [PATCH] mfd: davinci_voicecodec: fix possible null-ptr-deref davinci_vc

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Message-ID: <20220426030857.3539336-1-yangyingliang@huawei.com>
Date:   Tue, 26 Apr 2022 11:08:57 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <lee.jones@...aro.org>, <nsekhar@...com>, <arnd@...db.de>
Subject: [PATCH] mfd: davinci_voicecodec: fix possible null-ptr-deref davinci_vc_probe()

It will cause null-ptr-deref when using 'res', if platform_get_resource()
returns NULL, so move using 'res' after devm_ioremap_resource() that
will check it to avoid null-ptr-deref.
And use devm_platform_get_and_ioremap_resource() to simplify code.

Fixes: b5e29aa880be ("mfd: davinci_voicecodec: Remove pointless #include")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/mfd/davinci_voicecodec.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/davinci_voicecodec.c b/drivers/mfd/davinci_voicecodec.c
index e5c8bc998eb4..965820481f1e 100644
--- a/drivers/mfd/davinci_voicecodec.c
+++ b/drivers/mfd/davinci_voicecodec.c
@@ -46,14 +46,12 @@ static int __init davinci_vc_probe(struct platform_device *pdev)
 	}
 	clk_enable(davinci_vc->clk);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
-	fifo_base = (dma_addr_t)res->start;
-	davinci_vc->base = devm_ioremap_resource(&pdev->dev, res);
+	davinci_vc->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 	if (IS_ERR(davinci_vc->base)) {
 		ret = PTR_ERR(davinci_vc->base);
 		goto fail;
 	}
+	fifo_base = (dma_addr_t)res->start;
 
 	davinci_vc->regmap = devm_regmap_init_mmio(&pdev->dev,
 						   davinci_vc->base,
-- 
2.25.1